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You can only reschedule 24 hours before the exam starts
Be sure to reschedule or cancel exam appointments at least 24 hours before your scheduled exam or your fee will be forfeited. If you used a company-purchased voucher, the voucher will be forfeited. If you no-show for your exam appointment, your Company may be charged a no-show Fee.
You will need to contact support https://aka.ms/CertificationSupport